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International Conference on computer Vision Theory and Applications (VISAPP)

作者： Tijmen Klein Matthew van der Zwan Alexandru Telea Scientific Visualization and Computer Graphics University of Groningen Groningen The Netherlands

ISBN: (纸本)9781479976867

We present a novel set of techniques for visualization of very large data sets encoding flight information obtained from Air Traffic Control. The aims of our visualization are to provide a smooth way to explore the available information and find outlier spatio-temporal patterns by navigating between fine-scale, detail, views on the data and coarse overviews of large areas and long time periods. To achieve this, we extend and adapt several image-based visualization techniques, including animation, density maps, and bundled graphs. In contrast to previous methods, we are able to visualize significantly more information on a single screen, with limited clutter, and also create real-time animations of the data. For computational scalability, we implement our method using GPU-accelerated techniques. We demonstrate our results on several real-world data sets ranging from hours over a country to one month over the entire world.

关键词： Data visualization Image color analysis Animation Airports Scalability Trajectory Airplanes

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Online reconstruction of textured triangle meshes from aerial images

Online reconstruction of textured triangle meshes from aeria...

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2013 Eurographics Workshop on Urban Data Modelling and Visualisation, UDMV 2013

作者： Vierjahn, Tom Roters, Jan Moser, Manuel Hinrichs, Klaus Mostafawy, Sina Rmh New Media GmbH Cologne Germany Visualization and Computer Graphics Research Group Department of Computer Science University of Muenster Germany Department of Media FH Duesseldorf University of Applied Sciences Germany

ISBN: (纸本)9783905674460

In this paper we present and evaluate a new online reconstruction algorithm to create a textured triangle mesh from a set of aerial images via an unorganized point cloud. Both the point cloud and the mesh are iteratively refined while allowing new aerial images to be added at any time during reconstruction. Texture coordinates are learnt to instantly visualize an initially rough approximation that gets refined as more data becomes available. The new algorithm improves upon other systems that require the complete data to be acquired beforehand, and that apply offline, non-iterative reconstruction and processing. Thus, our algorithm is perfectly suited for time-critical applications, e. g., strategical visualization platforms for disaster and emergency response. © 2013 The Eurographics Association.

关键词： Iterative methods

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The arrigo showcase reloaded - Towards a sustainable link between 3D and semantics

The arrigo showcase reloaded - Towards a sustainable link be...

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9th International Symposium on Virtual Reality, Archaeology, and Cultural Heritage, VAST 2008

作者： Havemann, S. Settgast, V. Berndt, R. Eide, O. Fellner, D.W. Institute of Computer Graphics and Knowledge Visualization TU Graz Austria Unit for Digital Documentation University of Oslo Norway TU Darmstadt and Fraunhofer IGD Germany

ISBN: (纸本)9783905674149

It is still a big technical problem to establish a relation between a shape and its meaning in a sustainable way. We present a solution with a markup method that allows to label parts of a 3D object in a similar way to labeling parts of a hypertext. A 3D-markup can serve both as hyperlink and as link anchor, which is the key to bi-directional linking between 3D objects and web documents. Our focus is on a sustainable 3D software infrastructure for application scenarios ranging from e-mail and internet over authoring and browsing semantic networks to interactive museum presentations. We demonstrate the workflow and the effectiveness of our tools by re-doing the Arrigo 3D showcase. We are working towards a "best practice" example for information modeling in cultural heritage. ©The Eurographics Association 2008.

关键词： Hypertext systems

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Declarative procedural generation of architecture with semantic architectural profiles

Declarative procedural generation of architecture with seman...

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IEEE Symposium on Computational Intelligence and Games, CIG

作者： Levi van Aanholt Rafael Bidarra Computer Graphics and Visualization Group Delft University of Technology The Netherlands

ISBN: (数字)9781728145334

ISBN: (纸本)9781728145341

Procedural content generation (PCG) for architecture is widely used in a variety of digital media, most notably in games. However, such methods are often limited in their expressive range, and require considerable technical knowledge to create non-trivial architectural structures. We present a novel tile-based PCG approach for generating architecture, that proposes the use of architectural profiles, a declarative characterization of architectural typology, within a generic tile solving framework. An architectural profile consists of a set of tiles, representing atomic architectural building blocks, and a set of declarative constraints and rules, specifying which conditions a tile configuration has to satisfy to be valid. These conditions are translated into logic constraints, and used by a tile solver to control tile placement in a bottom-up manner. Eventually, each valid model output by the solver is a representative instance of its architectural profile. We describe an implementation of this approach with Answer Set Programming, using an off-the-shelf constraint solver for model generation. We performed an expressive range analysis, and concluded that our declarative method is quite controllable and can be steered over a broad range of architectural structures, regarding density and repetitiveness. Due to this expressive range and control, our tile-based method is very suitable for the customized development of urban environments for games.

关键词： Tiles Shape Semantics computer architecture Buildings Computational modeling Architecture

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Acceleration techniques for GPU-based volume rendering

Acceleration techniques for GPU-based volume rendering

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IEEE Conference on visualization

作者： J. Kruger R. Westermann Computer Graphics and Visualization Group Technical University Munich Germany

Nowadays, direct volume rendering via 3D textures has positioned itself as an efficient tool for the display and visual analysis of volumetric scalar fields. It is commonly accepted, that for reasonably sized data sets appropriate quality at interactive rates can be achieved by means of this technique. However, despite these benefits one important issue has received little attention throughout the ongoing discussion of texture based volume rendering: the integration of acceleration techniques to reduce per-fragment operations. In this paper, we address the integration of early ray termination and empty-space skipping into texture based volume rendering on graphical processing units (GPU). Therefore, we describe volume ray-casting on programmable graphics hardware as an alternative to object-order approaches. We exploit the early z-test to terminate fragment processing once sufficient opacity has been accumulated, and to skip empty space along the rays of sight. We demonstrate performance gains up to a factor of 3 for typical renditions of volumetric data sets on the ATI 9700 graphics card.

关键词： Acceleration Rendering (computer graphics) Hardware computer graphics Sampling methods Data visualization Three dimensional displays computer displays Performance gain Chromium

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GPU-friendly high-quality terrain rendering

GPU-friendly high-quality terrain rendering

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14th International Conference in Central Europe on computer graphics, visualization and computer Vision 2006, WSCG'2006 - In Co-operation with EUROgraphics

作者： Schneider, Jens Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universitä München Lehrstuhl I15 Boltzmannstraße 3 D-85748 Garching bei München Germany

ISBN: (纸本)8086943038

We present a LOD rendering technique for large, textured terrain, which is well-suited for recent GPUs. In a preprocess, we tile the domain, and we compute for each tile a discrete set of LODs using a nested mesh hierarchy. This hierarchy can be encoded progressively. At run time, continuous LODs can simply be generated by interpolation of per-vertex height values on the GPU. Any mesh re-triangulation at run-time is avoided. Because the number of triangles in the mesh hierarchy is substantially decimated and by progressive transmission of vertices, our approach significantly reduces bandwidth requirements. During a typical fly-over we can guarantee extremely small pixel errors at very high frame rates. Copyright © UNION Agency - Science Press.

关键词： Data transfer

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An interactive video system for live coverage transmission using real time video hyperlinks

Advances in Automation, Multimedia and Video Systems, and Mo...

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Advances in Automation, Multimedia and Video Systems, and Modern computer Science 2001年 309-313页

作者： Wichert, Reiner Finke, Matthias Balfanz, Dirk Mobile Information Visualization Computer Graphics Center Rundeturmstrasse 6 64283 Darmstadt Germany

ISBN: (纸本)9608052440

In this paper, we present a system developed for getting additional information from real time video hyperlinks within a live video. It is realized by introducing markers in the scene, which can be detected by the system itself. The primary advantage of the system is the generation of real time video hyperlinks by the video content itself. The system uses optical markers to link the additional information to the object of interest. Any retrieval of additional information is initialized by a user request. Finally, a first system prototype demonstrates the validity of this approach and shows the potential of this application.

关键词： Video signal processing

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1 Course description

1 Course description

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ACM SIGGRAPH 2007 - International Conference on computer graphics and Interactive Techniques

作者： Kasik, Dave Gobbetti, Enrico Marton, Fabio Manocha, Dinesh Yoon, Sung-Eui Correa, Wagner Bruderlin, Beat Stephens, Abe Slusallek, Philipp Dietrich, Andreas Quilez, Iñigo Boeing Enterprise Visualization China Italy Department of Computer Science University of North Carolina Chapel Hill United States Lawrence Livermore National Laboratory United States Visualization Systems Group United States United States Department of Computer Science Technical University of Ilmenau Germany University of Utah's SCI Institute United States Department of Computer Graphics and Digital Media Saarland University Germany Computer Graphics Group Saarland University Germany

No abstract available

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A Constructivism-based Approach to Treemap Literacy in the Classroom

A Constructivism-based Approach to Treemap Literacy in the C...

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44th Annual Conference on European Association for computer graphics, EUROgraphics 2023

作者： Firat, Elif E. Lang, Colm Srinivas, Bhumika Peng, Ilena Laramee, Robert S. Joshi, Alark Department of Computer Engineering Cukurova University Turkey Visualization and Graphics Lab Department of Computer Science University of San Francisco CA United States School of Computer Science University of Nottingham United Kingdom

ISBN: (纸本)9783038682103

Treemaps are a popular representation to show hierarchical as well as part-to-whole relationships in data. While most students are aware of node-link representations/network diagrams based on their K-12 education, treemaps are often a novel representation to them. We present our experience of developing a software using principles from constructivism to help students understand treemaps using linked, side-by-side views of a node-link diagram and a treemap of the same data. Based on the qualitative survey conducted at the end of the intervention, students found the linked views to be beneficial for understanding hierarchical representation of data using treemaps. © 2023 The Authors.

关键词： Students

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An interactive video system supporting e-commere product placement

Advances in Automation, Multimedia and Video Systems, and Mo...

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Advances in Automation, Multimedia and Video Systems, and Modern computer Science 2001年 256-261页

作者： Balfanz, Dirk Finke, Matthias Jung, Christoph Wichert, Reiner Mobile Information Visualization Computer Graphics Center Rundeturmstrasse 6 64283 Darmstadt Germany

ISBN: (纸本)9608052440

Based on the technological progress within the Internet, content like digital video has become more and more popular for any kind of user. Because of these new technologies a merging process of different media types has been started which leads to new kinds of applications. Within this paper such a new application is presented based on an interactive video system for the area of E-commerce. hi order to be competitive as an e-shop provider on the market it is highly important to supply the customers with an recognizable added value concerning the presentation of the product line. The embedding of such a system for using an interactive video in the context of E-commerce is the main focus of this work.

关键词： Electronic commerce

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